Which type of fuse can detect and isolate a short circuit almost instantly?

The type of fuse that can detect and isolate a short circuit almost instantly is a non-time delay fuse. Non-time delay fuses are designed to respond rapidly to overcurrent conditions, including short circuits. Their construction enables them to blow quickly when the current exceeds the rated capacity, thereby protecting the circuit and preventing further damage to equipment or wiring.

In contrast, time delay fuses are specifically designed to tolerate temporary overloads without blowing. This characteristic is useful in applications where inrush currents may occur, such as with certain motors, but it means that they won't react as swiftly to genuine short circuit conditions.

Current rating fuses refer to the specific rating of the fuse based on the amount of current it can handle, rather than its response time. Lastly, thermal circuit breakers provide a different mechanism for protection, relying on heat generated by excess current to trip the circuit. While they can offer protection, their response time may vary based on the design and mechanism.

Thus, non-time delay fuses provide the best option for immediate detection and isolation of short circuits, ensuring rapid protection of the electrical system.